CN101066793A - Process of eliminating heavy metals from city sewage and sludge - Google Patents
Process of eliminating heavy metals from city sewage and sludge Download PDFInfo
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- CN101066793A CN101066793A CNA2007101080520A CN200710108052A CN101066793A CN 101066793 A CN101066793 A CN 101066793A CN A2007101080520 A CNA2007101080520 A CN A2007101080520A CN 200710108052 A CN200710108052 A CN 200710108052A CN 101066793 A CN101066793 A CN 101066793A
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Abstract
The present invention discloses process of eliminating heavy metals from city sewage and sludge. The heavy metal eliminating apparatus consists of simplified sequencing batch bioreactor, concentrating and settling tank and pH regulating tank, and the simplified sequencing batch bioreactor as the main treating apparatus operates in the simplified process comprising feeding sludge, aerobic reaction, aerobic sludge elimination and feeding sludge. The main reactor has exhaust ratio designed in optimal sludge inoculating amount, and the un-exhausted sludge is used for the next batch. The present invention has short treating period, and the treated sludge has the contents of residual Cu, Zn, Cd, Ni and other heavy metal reaching relevant standard.
Description
Technical field
The present invention relates to a kind ofly can solve the exceed standard heavy metal removal method of problem of heavy metal concentration in the city sewage and sludge.
Background technology
Along with the raising year by year of China's treatment rate of domestic sewage, the safe disposal of the municipal sludge that output is huge and utilize problem to become the key of restriction municipal sewage treatment cause benign development.Regular product as municipal sewage treatment, contain holophytic nutrition elements such as abundant nitrogen, phosphorus, potassium and organic matter in the municipal sludge, through being the good source of manure and good soil improvement agent after innoxious, the stabilization treatment, therefore, the resource utilization of city sewage and sludge is agricultural is paid attention to by people gradually.But be the combined sewage of trade effluent and sanitary sewage in the water inlet of the most sewage works of China, heavy metal element wherein is concentrated in the mud by effect such as chemical settling, microorganism absorption absorptions in sewage treatment process, causes that Cu, Zn, heavy metals such as Cd, Ni are in the level of exceeding standard for a long time in the sewage sludge in China majority cities.As utilizing these to contain high concentration sludge, to carry out resource utilization agricultural, can be to being received that soil, farm crop and plant produce reality or potential endangers.At present, mainly adopt in mud at this problem and to add passivator and alkaline material wherein heavy metal is carried out stabilization treatment, the total amount of heavy metal does not obtain cutting down in the mud of back owing to handle, and easily causes influence such as the series of negative of using the decline of soil soil property, crop production reduction or heavy metal accumulation in its follow-up recycling process.Propose to utilize the bioleaching method to remove or cut down the heavy metal element of mud middle and high concentration at the existing part expert of this problem China, wherein Agricultural University Of Nanjing is 02112924.X (method of thiobacillus ferrooxidant and removal sludge heavy-metal thereof) and 200410014801.X (biological eliminating method of chromium in thiobacillus thiooxidans and the leather-making mud) about two patents of this technology, wherein the former has mainly reported these class methods of utilizing the thiobacillus ferrooxidans to remove sludge heavy-metal, the latter then is primarily aimed at industrial leather-making mud and has invented the treatment process that removes heavy metal chromium in the leather-making mud, but processing is constructed more in this technology, technical process is long, seed sludge derives from the mud of post precipitation, and adopt machinery to reflux, be not suitable for the removal of heavy metal in the municipal sludge.For city sewage and sludge is handled, should consider to utilize existing processing to construct the excess sludge that produces is carried out the heavy metal removing processing with the place.
Summary of the invention
The objective of the invention is in the recycling process of city sewage and sludge to the deficiency of heavy metal content control techniques; taking into full account under the prerequisite of utilizing the existing sludge treatment structures in municipal sewage plant; provide a kind of simple and easy to do, be easy to the method for heavy metal in the removal city sewage and sludge of large-scale promotion and application.
Concrete steps of the present invention are
(1) excess sludge of municipal sewage plant's secondary sedimentation basins and acidophilic microorganism are grown required energy matter is sent in the sbr reactor device, carries out the domestication of indigenous acidophilic microorganism under the aeration condition;
(2) brake specific exhaust emission mud during ORP=500mv, is discharged by design in pH of mixed=2.5 in reactor, is rich in acidophilic microorganism in the remaining mud, as the seed sludge of reactor operation;
(3) fresh sludge is sent in the sbr reactor device by secondary sedimentation basins by sludge pump, in the sbr reactor device, add energy matter by the metering administration device simultaneously, seed sludge in fresh sludge and energy matter and the reactor is thorough mixing under the aeration effect, enters the aerated reaction stage after reaching the design and operation water level;
(4) muddy water mixed solution after the processing is pressed design discharge brake specific exhaust emission mixed solution to the concentrating and precipitating pond under the waterpower state that keeps aeration to stir;
(5) muddy water mixed solution of Pai Chuing enters the concentrating and precipitating pond, realizes that mud concentrates and solid-liquid separation, and the mud after concentrating is through dehydration, and is used for follow-up recycling after alkaline material mixes;
(6) the concentration basin supernatant liquor enters the pH regulator pond, is back to the sewage treatment process section through transferring pH to alkali neutrality, after the high density heavy metal sludge collection of equalizing tank as the industrial raw material utilization;
(7) through after the step (4), the main body reactor is in the idle stage, and treatment process can continue by (3)~(4) operation, and so circulation is carried out.
Processing feature of the present invention and effect
(1) adopts periodical operation, meet the operation characteristic of current medium and small sludge of sewage treatment plant treatment process;
(2) this Processing Equipment is less, floor space is little, easy to operate, taken into full account the original sludge treatment of existing sewage work and constructed and construction characteristics;
(3) the main body reactor has also been finished the seeded process of leaching microorganism when finishing spoil disposal, and does not need to establish lift technique in addition, has reduced number of devices and has realized motorless sludge seeding operation;
(4) bioleaching liquid is back to sewage treatment process top after transferring pH, does not influence wastewater treatment efficiency;
(5) sediment that forms in the pH regulator pond is rich in plurality of heavy metal and ferro element, can be reclaimed or fully utilize;
(6) change traditional precipitation sludge discharge way, adopted more to utilize to keep microorganism active and inhomogeneity aeration sludge discharge way.
By the present invention handle typical urban mud running condition, with the ferrous sulfate is that energy matter carries out the bioleaching processing, Cu, Zn, Ni, Cd etc. all obtain the clearance more than 70% in the mud of processing back, its residual content all reaches (GB4284-84) standard of country's " agricultural mud pollutent control criterion ", stable and reliable operation.
Description of drawings
Fig. 1 is a schema of the present invention.
Embodiment
Embodiment:
Adopt Guilin city urban sewage purification factory secondary sedimentation basins excess sludge, the fundamental characteristics of this mud sees Table 1.
The table 1 test fundamental characteristics of excess sludge
Project | pH | Organic (%) | N (g/kg) | P (g/kg) | K (g/kg) | Cu | Zn | Ni | Cd | Cr | Pb |
mg/kg | |||||||||||
The result | 6.6 | 39.6 | 48.3 | 21.1 | 8.5 | 444.6 | 971.6 | 57.2 | 19.4 | 111.1 | 139.2 |
(1) under the room temperature condition, the excess sludge in the heavy pond of municipal sewage plant's secondary is sent into sludge heavy-metal by sludge pump remove among the device SBR,, add ferrous sulfate (FeSO by 10g/L when excess sludge concentration (MLSS) is 8~12g/L
47H
2O) the energy substrate of cultivating as acidophilic microorganism, the perforated pipe by the reactor bottom setting provides O in mud
2And CO
2, aeration intensity is 2.0L/min.Through 6~8 days, the pH of mud dropped to 2.2, and the ORP value is elevated to 550mv, and acidophilic microorganism concentration increases in the mud, and thiobacillus ferrooxidant becomes superiority bacteria spp gradually, the seed sludge that the mud of this moment just moves as reactor start-up.
(2) enter the remaining seed sludge that is rich in microorganism in the mud of sbr reactor device and energy matter and the reactor, mixed fully under the aeration effect, acidophilic microorganism begins to make full use of energy matter and a large amount of breeding in system simultaneously, and sludge pH begins to descend;
(3) through after a while after the processing of (1.5~2.0 days), the pH value descends fast in the reactor, the ORP value raises rapidly, when energy matter is ferrous salt, the color of mud also considerable change can occur in the reactor, become brown by original chocolate, this moment, sludge pH reached Schwellenwert (2.0~2.5), and the reactor operation enters the spoil disposal stage.
(4) by testing when determining to be the energy substrate with the ferrous sulfate, be 1: 1.3 by the delivery ratio of sludge seeding amount 30% design sbr reactor device, single batch processing sludge quantity accounts for 70% of sbr reactor device useful volume.Add energy matter by the fresh sludge amount that enters reactor, carry out aeration simultaneously, mix.Through operation in 1~2 day, the pH of mud is 2.0~2.5, ORP is 480~550, the bio-oxidation rate of ferrous ion reaches more than 95% in the mud, keeping under the aeration state this moment, mud after handling is drained into the concentrating and precipitating pond outward, simultaneously the mud that is rich in microorganism according to operation design variable retained part in reactor as under the seed sludge of batch processed, consider the homogeneity and the microbic activity of seed sludge, adopt the aeration sludge discharge way, mud is by entering the concentrating and precipitating pond by draining than the outer comb that is provided with;
(5) mud mixed liquid of Pai Chuing enters the concentrating and precipitating pond, realizes that mud-water separation and mud concentrate;
(6) through after the step (4), sludge pump starts to be sent into secondary sedimentation basins mud SBR and adds energy matter, is so undertaken by (2)~(4) step, and entire treatment technology is moved so repeatedly.Mud mixed liquid after the processing is discharged mixed solution by the design delivery ratio under the waterpower state that keeps aeration to stir;
(7) mud behind the concentrating and precipitating adds milk of lime behind mechanical dehydration, in and acid sludge in order to later use.The supernatant liquor in concentrating and precipitating pond is rich in the plurality of heavy metal ion regulates pH to alkali neutrality with milk of lime, and removed heavy metal is concentrated in the sediment, can be used for Metal smelting or ferrite comprehensive utilization.Sewage behind the adjusting pH enters the sewage pump room of urban sewage treatment process.
Interpretation of result
Discharge mud centrifugation 15min under 4000r/min of SBR, the precipitation part is under field conditions (factors) or under the cold condition (40 ℃~60 ℃), with the mud oven dry, through HCl+HNO
3+ HClO
4After the mixing acid agent is cleared up, with the heavy metal content in the PE-AAnalyst700 type Atomic Absorption Spectroscopy AAS analysis digestion solution.As calculated, after reactor moves 2 days continuously, the clearance of Cu, Zn, Cd can reach 78.3%, 77.7%, 100% in the sewage sludge, residual concentration 100.5mg/kg and the 216.8mg/Kg of the element Cu that mainly exceeds standard and Zn, meet the agricultural sludge heavy-metal limitation standard of China, it is agricultural to carry out follow-up resource utilization.
Claims (5)
1, a kind of method of removing heavy metal in the city sewage and sludge is characterized in that concrete steps are:
(1) excess sludge of municipal sewage plant's secondary sedimentation basins and acidophilic microorganism are grown required energy matter is sent in the sbr reactor device, carries out the domestication of indigenous acidophilic microorganism under the aeration condition;
(2) brake specific exhaust emission mud during ORP=500mv, is discharged by design in pH of mixed=2.5 in reactor, is rich in acidophilic microorganism in the remaining mud, as the seed sludge of reactor operation;
(3) fresh sludge is sent in the sbr reactor device by secondary sedimentation basins by sludge pump, in the sbr reactor device, add energy matter by the metering administration device simultaneously, seed sludge in fresh sludge and energy matter and the reactor is thorough mixing under the aeration effect, enters the aerated reaction stage after reaching the design and operation water level;
(4) muddy water mixed solution after the processing is pressed design discharge brake specific exhaust emission mixed solution to the concentrating and precipitating pond under the waterpower state that keeps aeration to stir;
(5) muddy water mixed solution of Pai Chuing enters the concentrating and precipitating pond, realizes that mud concentrates and solid-liquid separation, and the mud after concentrating is through dehydration, and is used for follow-up recycling after alkaline material mixes;
(6) the concentration basin supernatant liquor enters the pH regulator pond, is back to the sewage treatment process section through transferring pH to alkali neutrality, after the high density heavy metal sludge collection of equalizing tank as the industrial raw material utilization;
(7) through after the step (4), the main body reactor is in the idle stage, and treatment process can continue by (3)~(4) operation, and so circulation is carried out.
2, method according to claim 1, it is characterized in that the energy matter of excess sludge, acidophilic microorganism growth of municipal sewage plant and seed sludge advance the mud stage at the sbr reactor device and obtain thorough mixing, when excess sludge concentration is 8~12g/L, substrate is a ferrous salt, under the room temperature condition, the dosage of energy substrate is a 10g/L mud.
3, method according to claim 1 is characterized in that under the sbr reactor device room temperature environment that to have a liking for the ferrous thiobacillus of acid oxidase serve as main when handling bacterial classification, and its delivery ratio is designed to 1: 1.3, and the reactor cycle of operation is 1~2 day.
4, method according to claim 1, it is characterized in that mud middle and high concentration heavy metal remove after the in addition utilization of resources, the sediment in the pH regulator pond is rich in Fe, Zn, Cu, also can be reclaimed or fully utilize.
5, method according to claim 1 is characterized in that sbr reactor device operation sequence obtains simplifying, and adopts the aeration spoil disposal, and microorganism has good activity in the seed sludge.
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Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102730920A (en) * | 2012-07-14 | 2012-10-17 | 哈尔滨工业大学 | Preparation method of iron-based activated sludge and method for adsorbing heavy metals of cadmium, copper and/or lead in sewage by iron-based activated sludge |
CN103739183A (en) * | 2014-01-09 | 2014-04-23 | 浙江卓锦工程技术有限公司 | Treatment method and treatment device for deep dehydration of industrial wastewater sludge |
CN104370363A (en) * | 2014-11-09 | 2015-02-25 | 吉林建筑大学 | Microaerobic SBR (sequencing batch reactor) control parameters for treating nondegradable industrial wastewater |
CN104370363B (en) * | 2014-11-09 | 2017-01-04 | 吉林建筑大学 | The micro-aerobic SBR processing indegradable industrial effluent controls parameter |
CN107434751A (en) * | 2017-08-04 | 2017-12-05 | 山东森博生物科技有限公司 | A kind of method that biological organic carbon fertilizer is produced using black liquor of pulp making |
CN108191183A (en) * | 2018-01-23 | 2018-06-22 | 广东工业大学 | The minimizing technology of heavy metals in city sewage sludge |
CN109626600A (en) * | 2019-01-31 | 2019-04-16 | 光大水务(深圳)有限公司 | The preparation method and method for sludge treatment of a kind mud |
CN114850195A (en) * | 2022-07-06 | 2022-08-05 | 矿冶科技集团有限公司 | Stabilizing agent for lead, arsenic and cadmium and method for treating multi-metal calcium-based slag mud by using stabilizing agent |
-
2007
- 2007-05-22 CN CNB2007101080520A patent/CN100478285C/en not_active Expired - Fee Related
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102730920A (en) * | 2012-07-14 | 2012-10-17 | 哈尔滨工业大学 | Preparation method of iron-based activated sludge and method for adsorbing heavy metals of cadmium, copper and/or lead in sewage by iron-based activated sludge |
CN103739183A (en) * | 2014-01-09 | 2014-04-23 | 浙江卓锦工程技术有限公司 | Treatment method and treatment device for deep dehydration of industrial wastewater sludge |
CN104370363A (en) * | 2014-11-09 | 2015-02-25 | 吉林建筑大学 | Microaerobic SBR (sequencing batch reactor) control parameters for treating nondegradable industrial wastewater |
CN104370363B (en) * | 2014-11-09 | 2017-01-04 | 吉林建筑大学 | The micro-aerobic SBR processing indegradable industrial effluent controls parameter |
CN107434751A (en) * | 2017-08-04 | 2017-12-05 | 山东森博生物科技有限公司 | A kind of method that biological organic carbon fertilizer is produced using black liquor of pulp making |
CN108191183A (en) * | 2018-01-23 | 2018-06-22 | 广东工业大学 | The minimizing technology of heavy metals in city sewage sludge |
CN109626600A (en) * | 2019-01-31 | 2019-04-16 | 光大水务(深圳)有限公司 | The preparation method and method for sludge treatment of a kind mud |
CN114850195A (en) * | 2022-07-06 | 2022-08-05 | 矿冶科技集团有限公司 | Stabilizing agent for lead, arsenic and cadmium and method for treating multi-metal calcium-based slag mud by using stabilizing agent |
CN114850195B (en) * | 2022-07-06 | 2022-09-23 | 矿冶科技集团有限公司 | Stabilizing agent for lead, arsenic and cadmium and method for treating multi-metal calcium-based sludge by using stabilizing agent |
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